METHOD FOR CONTROLLING CARBON CONTENT AT END POINT IN CONVERTER

摘要

PURPOSE:To control the aimed carbon content in molten steel at end point in a converter at good accuracy by refining dephosphorized molten iron in the converter, measuring the carbon content and temp. in the molten steel at end stage of blowing and finding the necessary blowing oxygen rate with the specific decarbonizing equation. CONSTITUTION:At the time of refining the dephosphorized molten iron with less-slag in the converter, the carbon content and temp. in the molten steel in the converter are measured at the end stage of the blowing. By using these measured values, the decarbonizing model (in the equation, C: carbon content in the molten steel, Q: blowing oxygen rate, CT: transition point of decarbonization, CL: limiting point of decarbonization, alpha, beta: the content) is integrated with relation between the present carbon content and the aimed carbon content, and the necessary blowing oxygen rage is found to execute the blowing. Further, the decarbonizing transition point of this corresponding heat is calculated from the actual blowing data and feed-back thereof is executed to the next heat as the decarbonizing transition point CT. By this method, the carbon content and temp. at the end point in the converter is controlled at high accuracy.